package com.hbzjt2012.operator;

public class Demo04 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;

        a += b; // a = a + b
        a -= b; // a = a - b

        System.out.println(a);

        //字符串连接符    + , String
        System.out.println(a + b);  //30
        System.out.println("" + a + b); //1020
        System.out.println(a + b + ""); //30
    }
}
